A printer mounted enclosure for the Orange Pi Zero 2 with provisions for a fan. It just slides into an extrusion slot, no lock hardware needed.
There is a vent on the back side so that airflow should have to pass over the CPU.
You will need 4x M3-10 screws for the bottom cover, 4 M2.5x10 screws for the fan and 4 M2.5 nuts for the fan screws. You could also opt to mount the fan on the outside and use M3x10 screws if you so desired.
Get a multi-pack of screws here: https://amzn.to/43VavbL
There is room inside of the case for the included Wi-Fi/BT antenna, the fan, and maybe a little more.
Update 8 Apr 2023: Added a fan shroud to get airflow a bit more directed at the CPU. This along with the vent placement should help force air over, and then away from, the CPU and RAM.
Included STEP for remixing.